Senna's 1993 McLaren sells for almost $7m

A 1993 McLaren Formula One car raced by the late Brazilian world champion Ayrton Senna has sold for 4.2 million euros ($A6.65 million) at an auction in Monaco.

Auctioneers Bonhams did not reveal who bought the Ford Cosworth-powered MP4/8A car but said it went after a "lengthy and spirited bidding exchange".

Media reports had suggested former Formula One supremo Bernie Ecclestone, who is in Monaco and has an extensive collection of race cars, had bought it but he's told Reuters that's not the case.

The McLaren was the last Formula One car raced around the street circuit by the triple champion, who died at Italy's Imola circuit in May 1994 in a Williams, and took Senna to his record sixth win in the principality.

Bonhams said the fully-functional car, with the original V8 engine and gearbox, was the most historically important Formula One McLaren had presented at auction.

Senna's first Monaco car, a 1984 Toleman-Hart TG184, also sold at the 'Les Grandes Marques a Monaco' auction for 1.6 million euros ($A2.5 million).